I actually bought my first game from Japan, Racing Battle C1GP for the PS2 in May. Basically the same as TXR only on actual Japanese tracks, most of the rivals here are from prior Genki titles. I managed to beat this after over a month and there was this song called "Don't look back remix feat.RECALL" that played during the credits. I managed to find out the artist is named Vlidge. Unfortunately, that's all I could find - no lyrics, nothing. I tried to google what I could in Japanese but there is literally NOTHING on the internet. I got lucky with FLASH from TXR3 but it seems as though C1GP was more obscure. I was lucky to even find this video:
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